How to validate if notch filter is needed for Noise figure measurement.

Thread Starter


Joined May 11, 2018
Hi Everyone,

I am doing Noise figure with jammer measurement using notch filter to notch the RF Frequency . This is to make sure there should not be any down converted signal at base band .When i measure noise figure with and without filter, it is not varying since the noise at RF Frequency is lower than thermal noise , so it is not affecting ( assumption) .

what is the theoretical calculation to see the impact of noise contributed from signal generator at RF Frequency in noise figure measurement and to decide if notch filter is needed or not in measurement ?